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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

28199 results found.

  1. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  2. GRB 101112A: OSN and BTA observations
  3. GRB 101117B: Swift-XRT refined analysis
  4. GRB101114A: Swift/UVOT Upper Limits
  5. GRB 101114A: Confirmation of the X-ray afterglow
  6. GRB 101117B: Enhanced Swift-XRT position
  7. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  8. GRB 101117B: Swift detection of a burst
  9. XRF101117A: MAXI/GSC detection of a short X-ray transient
  10. GRB 101114A: GROND Upper limits
  11. Fermi GBM detection of a burst from a galactic source
  12. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  13. GRB 101114A, Swift-BAT GRB detected by ground processing
  14. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  15. GRB 101112A: Fermi GBM detection
  16. GRB 101112A: optical observations
  17. GRB 101112A - XRT source detection/analysis
  18. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  19. GRB101112A: Liverpool Telescope Afterglow Candidate
  20. GRB 100906A: optical observations
  21. GRB 101030A : MOA optical observation
  22. GRB 101030A: GROND optical/NIR afterglow candidate
  23. GRB 101030A : Swift XRT refined analysis
  24. GRB 101030A: Swift/UVOT Upper Limits
  25. GRB 101030A: Enhanced Swift-XRT position
  26. GRB 101030A: Swift detection of a burst
  27. GRB 101024A: GROND optical/NIR observations
  28. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  29. GRB 101024A: Swift XRT refined analysis
  30. GRB 101023A: miniTAO/ANIR NIR detection
  31. GRB101024A: Swift/UVOT
  32. GRB 101024A: GRAS06 optical observations
  33. GRB 101024A: Enhanced Swift-XRT position
  34. Swift/UVOT observations of GRB101023A
  35. GRB 101024A: Swift detection of a burst with an optical afterglow
  36. GGRB 101023A: GROND detection of the optical-NIR afterglow
  37. GRB 101023A: Swift-XRT Team Refined Analysis
  38. GRB 101023A: Gemini discovery of optical afterglow
  39. GRB 101023A: Enhanced Swift-XRT position
  40. GRB 101023A: REM NIR observations
  41. GRB 101023A: Swift detection of a burst
  42. GRB 101011A: miniTAO/ANIR NIR upper limits
  43. GRB 101020A: MASTER prompt and afterglow limit
  44. GRB 101020A: Swift detection of a burst
  45. GRB 101017A: miniTAO/ANIR NIR upper limits
  46. GRB 101017A: Swift XRT refined analysis
  47. GRB 101008A: optical observations
  48. GRB101017A: MITSuME Okayama optical upper limits
  49. GRB 101014A: Fermi LAT detection
  50. GRB 101017A: Enhanced Swift-XRT position
  51. GRB 101017A: Swift detection of a burst with optical counterpart
  52. GRB 101011A: Fermi GBM detection
  53. GRB 101011A: BOOTES-3 Upper Limit
  54. GRB 101014A: Fermi GBM detection
  55. GRB 100906A: D50 optical detection
  56. GRB 100902A: D50 optical limit
  57. GRB 101011A: Swift/UVOT observations
  58. GRB 101011A: Zadko observatory - Gingin optical observations
  59. GRB 101011A: XRT Refined Analysis
  60. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  61. GRB 101011A: Enhanced Swift-XRT position
  62. GRB 101011A: Swift detection of a burst
  63. GRB101008A, GROND detection of a fading afterglow
  64. GRB 101008A: Swift-XRT refined analysis
  65. GRB 101008A: SAO RAS optical observations
  66. GRB 100915 optical upper limit
  67. GRB 101008: Swift/UVOT Upper Limits
  68. GRB 101008A: Enhanced Swift-XRT position
  69. GRB 101008A: 1.23m CAHA optical observations
  70. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  71. GRB 101008A: Swift detection of a burst
  72. GRB 100728B: X-shooter redshift
  73. Refined analysis shows Swift Trigger 435520 is not a GRB
  74. Swift Trigger 435520 is probably not a GRB
  75. GRB 100928A: Swift detection of a burst
  76. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  77. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  78. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  79. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  80. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  81. GRB100925A UVOT afterglow
  82. GRB 100924A: GROND detection of an optical/NIR afterglow
  83. GRB 100925A: Swift detection of a burst
  84. GRB 100924A: Swift detection of a burst
  85. GRB 100916A: Fermi GBM detection
  86. GRB 100917A: Swift detection of a burst
  87. GRB100915A: MITSuME Ishigakijima Optical upper limits
  88. GRB 100915B: GRT Optical Observation
  89. GRB 100915A: GRT Optical Observation
  90. GRB 100915A: Swift/UVOT Upper Limits
  91. GRB 100915A: Swift-XRT refined analysis
  92. GRB 100915A: Enhanced Swift-XRT position
  93. GRB 100915A: Swift detection of a likely burst
  94. GRB 100910A: Fermi GBM detection
  95. Swift-BAT trigger 433953 is not a burst
  96. Swift BAT Trigger 433953 probably not a GRB
  97. GRB100909A: MITSuME Ishigakijima Optical upper limits
  98. GRB 100909A: Swift/UVOT observations
  99. GRB 100901A: optical observations in Mondy and R-light curve
  100. GRB100909A: NOT optical afterglow confirmation

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